That's a fantastic start, but I don't even know how to setup an RSS feed! :(
I know it's an XML file, but how do you get it to automatically add content? For example, a user submits a new photo with his/her geographical location. How do I get the XML file to automatically update with the .jpg file and the <georss:point> meta data?
You can create RSS feeds manually with a text editor if you like, but if you're looking for something automatic then you'll probably want something like a CMS to generate the feed for you. Most CMS and blog packages will do this for you.
The RSS spec [rssboard.org] is fairly simple. It's an XML dialect, so if you're familiar with web coding it won't be too difficult to grasp.